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Finding the Fourth Proportional to 1,125.16, 1,687.91 and 394.61

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Solution

The fourth proportional to 1,125.16, 1,687.91 and 394.61 is: 591.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.16 : 1,687.91 = 394.61 : x
  2. Step 2: Convert to fraction form
    1,125.16/1,687.91 = 394.61/x
  3. Step 3: Cross multiply
    1,125.16x = 1,687.91 × 394.61
  4. Step 4: Simplify right side
    1,125.16x = 666,055.75
  5. Step 5: Solve for x
    x = 666,055.75/1,125.16
  6. Step 6: Final answer
    x = 591.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.